ABSORPTION IN THE NEAR-ULTRAVIOLET WING OF THE KR2F-STAR (410-NM) BAND

An intracavity laser technique has been used to study the absorption of electron-beam pumped Ne/Kr/F2. gas mixtures (196 and 300 K) in the “blue wing” of the Kr2F* emission continuum. The experiments were conducted at 358 nm using the v’ = 0 -+ v” = 1 transition of the N2 (C →B) laser. Comparing the results with the predictions of a computer model, the species primarily responsible for absorption have been identified as Ne2+, Kr2+, and Kr2F*. The photoabsorption cross sections for Ne”1 and Kr2F* (Kr2+F-) at 358 nm have been estimated to be 8.1. 10-19 and 5.4. 10-18 cm2, respectively. The Kr2F* absorption cross section is roughly 20 percent of that reported for Kr2+at the same wavelength. The fluorescence efficiency of Kr2F* in e-beam ex-cited 94.93 percent Ne/5 percent Ki/0.07percent F2 (Ptotal = 4000 torr) gas mixtures has been found to be a factor of 2.8 higher than that of the N2(C--->B) band in Ar/5 percent N2 mixtures. Also, the rate constant for quenching of Kr2F* by F2. was measured to be (4.1 ± 0.5)· 10–10 cm3. s-1 at 300 K and (3.0 ± 0.5). 10–10 cm2. s-1 at 196 K. Copyright © 1979 by The Institute of Electrical and Electronics Engineers, Inc.